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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15d86f269ad45e2f771e3d6493f26a06009da072b05f6d51043258fd5e69d0e' 
  AND token = 'jPyBf2zJGbfOVzC41h5rdp5Z6ni75dksRywAZXBD/gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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