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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69679af59b3efd92a935abfb8ade2d671b59b2ff7b87600202fb4e369804e7d5' 
  AND token = 'kNXG1y0cDg2XZnIGrEVS1OOGq6uWOomzxBKerZdNmMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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