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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb49968ae74e3a8661c99113317b67135c6743a38598694147cc74678b733981' 
  AND token = 'a7TSy21ubFKHMs4ic4bAWkbhAfbIUxhatY3s2yvtyVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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