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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf0b1c2aff9f978f4cd66391c864f960de0ae7cb68c150339f140988e84dd2f' 
  AND token = 'RQRFM5P9JmKyMvFVmdYawG16xCYQixuAoI1qCqqtnZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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