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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78c91559b19ec2eb68129493b34a7be42c46d7df6d417945f97298496adb45b0' 
  AND token = 'mMJaYcDu5XgJbi7AWX4n8LYTZThnn+D020t7paukBgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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