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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6c949201f7804a9c89cdbfe6e9c860f636a82536cb8a5a1adf4e116aab0325' 
  AND token = 'mv5/azrarF8m+ciEwtnFyXssSWuIc7+uPMEPX33ehsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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