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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a12c0402910b708dfa58d8250767536eaae236a9ae1e57997579139b47efdd7' 
  AND token = '2EGo9oPtf9TcVu8kOuknJqMNZQBLRfvpX1Ace5TBhxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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