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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c12cdce364eeb4f9f6a729ec8f031ec767b4a9e425610412b3c725e6dcdcf6' 
  AND token = '7oULqNPdx+YR74ZDm41WYz2IDptsYOQhNBoO8pWPzrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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