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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67f7d619dabe1054312e1bcd7e1b7cf92643442babcc5fdff92b867ecf15872' 
  AND token = '4ngdHtxcAF/3HnuTtPlGMCcIF1s+Zk8VCucCYoQcakc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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