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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cff3d05a4eca2a2eb12ad3d30dbe0d87ab40f3b5073f61fe71f2f5c227326e1' 
  AND token = 'L9gSEzYN0y1TgAipF6B9wRiSEXy7y9c9Pu52LvvdILs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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