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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af58ba5773b3aa9b1dba6fc90c3ab2bf957a5472b769c4d5e82210e94c95a83' 
  AND token = 'dm2cDosrTKk0yxM34ZQoY7CiDb8hC9No2M9Lynlc6uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}