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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be7a084f0eac5e3dc7f890fc23ce82a31319a77cd44f27d29799121addbd96f' 
  AND token = 'Cm8c668RSmXv/OU9cuotVhL6WtwkmawVWoQLBK/TXEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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