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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318d99542599056b6bffde5f2b3177d62eeb4cf279661851eec2f81cbb7973cb' 
  AND token = 'Mz+CUsjEoDc6Eo0l1Vv8IAoZoD9da49Yw2Dpt7ZmTfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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