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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d316693c0b46b53d436e92708760c409d4a6ddeb2c63ba5995dcf6c8f96a80' 
  AND token = 'aJdQ5CHzxBQPa1JDcwOlpJ7/g7hzCDE/UnwU2U5CqUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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