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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc35ebcaabad0c1b3b3dd18656939a6ad3e127250fd14fa5e7bde8aaed4f2dc' 
  AND token = 'IheAKQt9G4i9NUnEzS54waPQeAsb2Aiy+niwAR76FXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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