SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17184c172aff639f6040bdbe4e8a69b6282a75b551e3e747e914564aab0107f1' 
  AND token = 'GBXJ76j/Tp2IDeUuJpbfYYBXCWiG/hJRmkykwQpi/Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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