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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3b7288aee4167112e0279aaef8c953f7a09998a4b4c7933306ff4998a3628a' 
  AND token = 'ThVxuniTsH5xFTtNCXxetvKieEX3JxlRYYC+4uA0d3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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