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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de80a2b7289f11296ec7ff97e79b0f6e3505a04defbf12d85ea803b34dd68f1b' 
  AND token = '1Npv1Vy4oUhb12xMhn7CtW6OIt3pTpLRebYob490430=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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