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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce7f38fa77272543b64275da202945fa796d750a609ef52823d0c21be26d068' 
  AND token = 'rnUxmXec0b8b1rnRZ9s9Bycnjs6uOckZQ6cr3na8WpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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