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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef43c047012386df4ef91f334d0c1a4a8f67beee5301767a2fde3acb9cbb97d' 
  AND token = 'wnf1fuZmpLcQwyl1ddNqQTYm+aJlzdU94JHeXs1xFh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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