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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '753e561bd801870d1e1d4d9d39c30117204de6d18831baef72fde7d0e3e28bbf' 
  AND token = 'prIqJO8psm4z+rkmF+5/L+tABL76PIcnZJq8XqB+vMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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