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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d77e5bdb6c744cb2e3436c34a0df987e440ed159f537d0b19ca8e58532ff9d3' 
  AND token = '6oXE9RUocawRdePS2IoJ6uLWPHB8Wyw3AMGkbnUZk/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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