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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d82499390b7b8175618e16cf11191b0b38422f97a7fe7b288fd18d751a6912' 
  AND token = 'GWLtEK5MIO6a4BbhbVa9/6Ep/0RdaUDrKTEe1FxU0ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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