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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39d0f392adca9c13a36ed2d7e4532a71fbc5ee0fc21cf1dfd1a5700eb6038af' 
  AND token = 'um2jx4HIsGR+CFtUj3K/aivs7doB4VOqMe3ECMNxcdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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