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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54cc25c8f1a3080348de8dfc841103352730c5aad0e025eb93d76a407e3b0ea4' 
  AND token = 'BNo5yIAJPqCFlzzRpSfu1XJ9uOlNggvC03r/bBJNzJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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