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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95017301e08a26c34d073cbcf43329a9503b3165d1f1b936356b9959f003d74' 
  AND token = 'vq0a4WKaPdBnW/TyJScQ/hiMibLudEv1vLfZ9f2zSKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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