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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2231f126e9200c669e8b4b9b0d44c3c45a3e7079f9020aacdc497bba51f8fcd' 
  AND token = '/Y8Mb3wgpw4/g2/n6CqrletJYthwdch7thl/Bp8GK6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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