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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52093bed5a38772cc6bcaadd112e033d4482d155746194ba799d832616652372' 
  AND token = '+BwArJ0C9FzAoNzeHwDp7YuHOL5HXptcG+TwKVJo7p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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