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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe46054d203c5c2c1f9bc207666c68b5e14d206e0ee50e672f15519f755d120' 
  AND token = 'jhjvb1kkd0e1dHQYxnNunNkfGGEtsRT8vPokH48Amzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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