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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba094fcbab343eb13ba5d6a08deedae0a8827e6c0ac03a977e1b2ea347dac07' 
  AND token = '3bBKCqE8ctOi838POv1M4UKAW89i5HSP9T6E9KK+FlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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