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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f85fddbfbce1c0fe16fb9dcefa46a0464f7392ed0c6b6b06a8fe490503f9e17' 
  AND token = 'DxqIr+zucN6R3hFgIdyXgxX0iGSGPCTnOItGzhqC35o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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