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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0092723e7a7cbfa5942b17741b28345632e40b5a37fefe475404bb2cc1696354' 
  AND token = 'yWsdSSGarKyzJppHUrrXHYQ6O0xIjF3+up9opFwjhuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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