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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afaa84e4f8c505b8b66109437b90f4fdf2fe61e1284d29d4ddd1cf205b0ccc34' 
  AND token = 'Em8+ugMYkMoEDT0Z8u/SubbLfmQPO6Aeh4yhx6lpZlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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