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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0d1db9c23392ee4436b9281b9ebc98e009136a164f8fcebbae4b2645711ca9' 
  AND token = 'IKF1rdDX5FGPc3qEkSte4dqDnHCn3oxw1tkBwryPwY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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