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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b932754be0cdb9333a98e797e556321855a392201b80f433b05296fdd1eecec0' 
  AND token = '3UFJWoazRPL2Oh5VwKcDg4/O8IgEkPhFrlpzBicy5Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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