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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8704961160ee4b6be20c120697427836263bfe6f71c7c333675c7fd1f18239' 
  AND token = 'AXpgCVIRv6Gz2xT/4el/KBtL7Q8a6wM6zZ7FBeZyne0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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