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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7828f301325192f72cd386c1e7a5341f98571f59aee0f8e8ad952ad550001d5b' 
  AND token = 'XC6rd5EvNafCi1OKBwOXq+nW3Ip5q5fZY5IvPXjeocw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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