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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1de763c174dd42076e8600e7bb7102db14a966e645f922a8adda6f59715bea' 
  AND token = 'mB4lTl2nokkETY3pG2A6hFaArFhmFju7EgWz00rcoCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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