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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16b6d5e85184d74aa5f029259abb4a1404875a0b88be96c8b4141d77be3f54ad' 
  AND token = 'k9K/b5k+jvpgMnhbUgIKyIdIeCxpeLVks/o6/R9g794=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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