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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d0269a81e73e14f474cd672f4628985484a02d2d88fc5f696bbf53b0916c7a' 
  AND token = 'UKieNrxN+PsUlgVvOnvSMWvCoKW6U7XkfjLcQy5CCW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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