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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec18bdd08abd230027f923640d659f71b4e72529bd406120065641cdd5f99b64' 
  AND token = 'WWkRzo7XB6GwsSrU6P8fsJBF05Hjs+QfNapeJCmsgok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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