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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02e50d0bb071dcc6e50d64a4a2cb61bee11a5d3a1397c3925c45b55c6fdf500' 
  AND token = 'mT2LDWOQ5oU3wtpOdv7vQnCarj/aTficvMOLf0QObaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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