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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5ec42bac17e884d6feb9c55225f943ee21060bfc53a5835da2fb853ce45e12' 
  AND token = 'wmDQ4P9LyJO7lOhxSeg7lBYsZ2tAcBO+jI+BCHHu9r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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