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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1997e30950b588da4fd50362f2decd2371ea24412d8de8212f49107422b45d80' 
  AND token = 'jzY1Ak4wNpzuvUnRfq3wizGY5SO47KSelGGcWmqjf3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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