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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e402cb6485f61d6a3d3844efb9d14de660f1452841de1e44a9f97da121824d' 
  AND token = 'hp35W0VFiXdgFRe5ipKJO0KPEAcCWEEvxcMWHWNR7T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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