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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7042f120bc0d9b8b9c1472fab68ae3ef97b2ad10958d3471033a460bdb1248b1' 
  AND token = 'sluSHzIDupUCBv7i3WaRS6RkT5lC3GIRbuQqr/zGkv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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