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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b371269bf311e2b05e7db46398ba87f3e7a5741d94df5aa9042dd7796935f7' 
  AND token = 'DlMgwoNCmBeA4hD8EW1HeQ901mL6iYVXbcvJsCghkH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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