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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8014824a298cd978100df42d56d841a1641bd255c64ede913c0253f4a62bc6a' 
  AND token = 'koyXG8p55gDXYHk1tJRS0z2xIZ1Yv2EcA3/Th9dDhQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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