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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e149da44ee0459d9a813248fce735c5e23135d1a695846185b34a38acf76a8' 
  AND token = 'gXgQvebkUxtI8YQN7t+Fg3jucBYSxa7fFVGEOb+aO/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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