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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '397287ce147277040911e46c20ee98a3bee4b105cdc6535bfc35c3ba71cb8fb1' 
  AND token = 'SW3iReB3ROphk8c4ynV/HeWbTCK57PMNO/q27pw1rIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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