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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62ef6248136cf3720e395bb378162d22b946f3ad63fa6b9f13cfb66e8849871' 
  AND token = 'tkvG/B7U7zKh3Jm3YAcGrz8sE44u0Nytw28v6KsHhgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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