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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2875636e05b9ed119f7d6c2e8df6386bb3201ae320a24cdd8474b96e68df5b6f' 
  AND token = 's/35PejTgMRHA0fvmpcsEsykGJtoJ08qyw4WqXXXFB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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