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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b71d2b5bdf937d340712fa495bb483b9d87a25c813f253736b57109cfd990a' 
  AND token = 'T4qAfx7865neTci/sa0AR9qK77aK99SEdpCvtX8siJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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