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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '045f435389f16543cf669925b1573cccdcc8cc5a43035bdeafdabf3c428232c8' 
  AND token = 'm5iDljmPZECTgEIlpiJ0MS8fE3vsz3Johft9A1+vEVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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