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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31f9d17b18f548c16a75567a04a8d22a3f0e7ee083a7e9387f19a6a12a58685' 
  AND token = 'tSZUuZc7gIlQF4/LczWKVRFeaucuSfxCyW8MH94jX2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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