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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7943050d4320259e8599ca62f2246dbe92f288ff59cd4c82c12ea482cd211a' 
  AND token = 'n5sWilzjOKF/B0tBcCa0GfsCS0Eh43SYputWgB04Gsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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