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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084de49ccc4c1e1b674fe5ab296c3b15297e44140dcf880c79c617b9f5cc65ce' 
  AND token = 'U/QihlTz+oq/Ezktu4bp7PL0qa4iwrXmGRQDTGQx2Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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