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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14fd12a11a184a658f2bd80bc1c7d034c25d2ab0215b2f3e5a97ccdb7d127ca3' 
  AND token = 'cTFkp3i1SIp4+EdpHZxnqaWub9AX9OA4N8hemr/oLps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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